Basically, there's no beating the test. The main active ingredient in weed is delta 9 tetrahydrocannabinol, which is somewhat fat soluable: it gets into large volumes of your body, and slowly leaches back into your bloodstream. Its two measured metabolites, nor-delta-9 tetrahydrocannabinol carboxylic acid and delta-9-tetrahydrocannabinol carboxylic acid do the same thing. If you get enough weed on board to get high, you will potentially have levels of THC, nor-THC-COOH and THC-COOH in your urine that the drug screen will detect for about a month.
There are mountains of things on the internet that claim to make you super clean; all of them are either ineffective, or detected on the integrity tests.
So, the only answer is to knock off the weed for at least 30 days, and hope that the stuff has cleared your system.
MD specially trained in handling drug screens